I was just looking though questions and stumbled upon this question (now deleted). There is nothing special about the question (and it's a dupe of many other very similar questions) but I felt that the I could help the OP with some basic programming given what I saw in the question and I wanted to give and answer. I started to write something but just as I was about to post it the OP deleted the question and I couldn't answer.
I already had the answer written out and I wanted the OP to have. I checked MSO and saw that you can't send private messages to another user, but I know that sometimes when two people discuss things in the comments, an automatic comment is added that suggest that they discuss it in a chat. Thus, I though that I could create a chat and give the answer there (which I did). After I did all that, it struck me that I had to get in touch with the OP to give a link to the chat. Since I knew that I couldn't send a message I left a comment on [another recent question of the OP].
I'm thinking that creating a new chat like that wan't really the right thing, and I'm pretty sure commenting like that on another answer is just wrong.
So, I have 2 sets of questions:
Can you create small throw away chat rooms like what I was trying to do and like the automatic chat rooms that are created when two people discuss things in comments?
Is there some more correct approach to delivering a "too late" answer? Should I perhaps have voted to undelete the question (even though the OP deleted it) and waited to answer it?